Percent Proportions

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What is a percent proportion?

Back

A percent proportion is a way to express a relationship between a part and a whole in terms of percentage. It is often written as part/whole = percent/100.

Front

How do you calculate the sales tax on an item?

Back

To calculate the sales tax, multiply the cost of the item by the sales tax rate (as a decimal). For example, if an item costs $100 and the sales tax rate is 6%, the sales tax would be $100 x 0.06 = $6.

Front

If Hank has $3000 and the total cost of the house is $2900 plus 6% sales tax, how do you find out how much more money he needs?

Back

First, calculate the total cost including tax: $2900 + ($2900 x 0.06) = $2900 + $174 = $3074. Then subtract Hank's savings: $3074 - $3000 = $74.

Front

What is the formula to find what percent one number is of another?

Back

The formula is (part/whole) x 100 = percent. For example, to find what percent 20 is of 50, use (20/50) x 100 = 40%.

Front

How do you convert a fraction to a percentage?

Back

To convert a fraction to a percentage, divide the numerator by the denominator and then multiply by 100. For example, 1/4 = (1 ÷ 4) x 100 = 25%.

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What is the percent equivalent of 3 out of 8?

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To find the percent equivalent, divide 3 by 8 and multiply by 100: (3/8) x 100 = 37.5%.

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How do you find the total number of dives a sea turtle makes in a specific time frame?

Back

To find the total number of dives in a specific time frame, use the rate of dives per hour. If a turtle makes 460 dives in 12 hours, the rate is 460/12 = 38.33 dives per hour. Multiply this rate by the number of hours to find the total dives.

Front

What is the relationship between percentages and fractions?

Back

Percentages are a way to express fractions with a denominator of 100. For example, 25% is equivalent to 25/100 or 1/4.

Front

How do you find what percent 30 is of 40?

Back

Use the formula (part/whole) x 100. Here, (30/40) x 100 = 75%.

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What is the importance of understanding percent proportions in real-life applications?

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Understanding percent proportions is crucial for making informed financial decisions, calculating discounts, taxes, and understanding statistics in various contexts.